[PATCH 2/3] perf bench syscall: Add close syscall benchmark

[Tiezhu Yang <yangtiezhu@loongson.cn>]

This commit adds a simple close syscall benchmark, more syscall
benchmarks can be added in the future.

Here are the test results:

  [loongson@linux perf]$ ./perf bench syscall

          # List of available benchmarks for collection 'syscall':

           basic: Benchmark for basic getppid(2) calls
           close: Benchmark for close(2) calls
             all: Run all syscall benchmarks

  [loongson@linux perf]$ ./perf bench syscall basic
  # Running 'syscall/basic' benchmark:
  # Executed 10000000 getppid() calls
       Total time: 1.956 [sec]

         0.195687 usecs/op
          5110201 ops/sec
  [loongson@linux perf]$ ./perf bench syscall close
  # Running 'syscall/close' benchmark:
  # Executed 10000000 close() calls
       Total time: 6.302 [sec]

         0.630297 usecs/op
          1586553 ops/sec
  [loongson@linux perf]$ ./perf bench syscall all
  # Running syscall/basic benchmark...
  # Executed 10000000 getppid() calls
       Total time: 1.956 [sec]

         0.195686 usecs/op
          5110232 ops/sec

  # Running syscall/close benchmark...
  # Executed 10000000 close() calls
       Total time: 6.302 [sec]

         0.630271 usecs/op
          1586619 ops/sec

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 tools/perf/bench/bench.h   |  1 +
 tools/perf/bench/syscall.c | 11 +++++++++++
 tools/perf/builtin-bench.c |  1 +
 3 files changed, 13 insertions(+)

diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h
index 6cefb43..916cd47 100644
--- a/tools/perf/bench/bench.h
+++ b/tools/perf/bench/bench.h
@@ -34,6 +34,7 @@ int bench_numa(int argc, const char **argv);
 int bench_sched_messaging(int argc, const char **argv);
 int bench_sched_pipe(int argc, const char **argv);
 int bench_syscall_basic(int argc, const char **argv);
+int bench_syscall_close(int argc, const char **argv);
 int bench_mem_memcpy(int argc, const char **argv);
 int bench_mem_memset(int argc, const char **argv);
 int bench_mem_find_bit(int argc, const char **argv);
diff --git a/tools/perf/bench/syscall.c b/tools/perf/bench/syscall.c
index 746fd71..058394b 100644
--- a/tools/perf/bench/syscall.c
+++ b/tools/perf/bench/syscall.c
@@ -46,6 +46,9 @@ static int bench_syscall_common(int argc, const char **argv, int syscall)
 		case __NR_getppid:
 			getppid();
 			break;
+		case __NR_close:
+			close(dup(0));
+			break;
 		default:
 			break;
 		}
@@ -58,6 +61,9 @@ static int bench_syscall_common(int argc, const char **argv, int syscall)
 	case __NR_getppid:
 		name = "getppid()";
 		break;
+	case __NR_close:
+		name = "close()";
+		break;
 	default:
 		break;
 	}
@@ -100,3 +106,8 @@ int bench_syscall_basic(int argc, const char **argv)
 {
 	return bench_syscall_common(argc, argv, __NR_getppid);
 }
+
+int bench_syscall_close(int argc, const char **argv)
+{
+	return bench_syscall_common(argc, argv, __NR_close);
+}
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index 334ab89..b63c711 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -52,6 +52,7 @@ static struct bench sched_benchmarks[] = {
 
 static struct bench syscall_benchmarks[] = {
 	{ "basic",	"Benchmark for basic getppid(2) calls",		bench_syscall_basic	},
+	{ "close",	"Benchmark for close(2) calls",			bench_syscall_close	},
 	{ "all",	"Run all syscall benchmarks",			NULL			},
 	{ NULL,		NULL,						NULL			},
 };
-- 
2.1.0